Improvement in printing-presses



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YQ/w@ l UNITED STATES PATENT OFFICE.

ANDREW CAMPBELL, OFV BROOKLYN, NEW YORK.

IMPROVEMENT IN PRINTING-PRESSES.,

Specification forming part of Letters Patent No. 56,701, dated J nly 31, 1866.

To all whom t may concern:

Be it known that I, ANDREW CAMPBELL, ofthe city of Brooklyn, county of Kings, and State of New York, have invented a new and useful mode of operating the bed of the printing-press, and also a new mode of constructing the bearings of the front guide shaft thereof; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1 is an elevation of the general construction Fig. 2, an elevation of the main driving-wheel a, and the reversing-gear d. (Shown at Fig. 4 in plan.) Fig. 3 is a sectional View of Fig. 2 through the dotted line A A.

The printing-press being acommon machine, and its principles being Well known to those skilled in the arts, I will omit any detailed description. but conne myself strictly to my improvements, the object of which is, rst, to increase the size of the sheet from a small cylinder with one revolution to an impression; second, to give a slow movement over the impression with a quicker return movement; third, to give an easyand controllable movement at the ends of the stroke of the bed without the use of recoil-springs at low rates of speed; fourth, to make a uniform resistance to the power by increasing the velocity of the bed when returning sufficient to equal the resistance produced by the impression on the slow forward movement.

To produce the above results, I use the wheel a, which is constructed with the external spur-gear, b, and the internal spur-gear, c, the two operating the wheel d, that is so arranged as to have the pitch-lines of the segments b andccoincide with the pitch-diameter of the wheel d, whose center is fixed relatively to the center of the wheel a.

d is furnished with two studs, e e, carrying rollers that are so placed as to have them pass grooved cams f g. When the wheel d has reached the end of the segment one of the rollers enters the groove and passes through,

while the other swings over the cheek of the groove, and, following the dotted line, enters the groove g. In passing forward the first roller leaves the groove f, and, in turn, swings over the cheek of the groove g, which movement, reversing the wheel d, enters the tooth at the foot of the groove g smoothly. The same operation .takes place when the wheel d reaches the end of the opposite segment and is again reversed, making one revolution of the wheel a and an evolution of the wheel d.

As the wheel a is keyed upon the end of the cylinder-shaft and must necessarily rise and fall with the cylinder while adjusting the impression upon the type, it becomes necessary to have the wheel d follow it to keep the rollers in the wheel d in their proper position to enter and leave the cams j' and g without striking the sides of the groove o. To secure this, Iconnect the boxes h and t together by means of the linkj, the lower arm, k, being hung at the point m, leaving the other end to move through the slot n.

The shaft p carries a pinion, q, that gears into a plain rack, s, upon the under side ofthe bed, giving it a'reciprocating motion.

To secure a uniform operation of the front guides of a printing-press, Icon struct the bearings in a V shape, as shown at T, Fig. l. By this means I prevent the rolling incident to bad itting and Wear of the parts and secure better register than can be had from a round box or bearing.

What I claim as my invention, and wish to secure by Letters Patent, isv 1. The mode of converting the rotary to a reciprocating or rectilinear motion, as above described, or its mechanical equivalent, for the purposes set forth.

2. The V-shaped bearing T, as applied to the front guide of printing-presses, substantially as described, and for the purposes set forth.

' ANDEEW CAMPBELL.

Witnesses:

SYDNEY vE. SMITH, W. MORRIS SMITH. 

